Year	metric tons
1960	0
1961	0
1962	0
1963	0
1964	0
1965	0
1966	0
1967	0
1968	0
1969	0
1970	0
1971	5
1972	10
1973	20
1974	20
1975	20
1976	20
1977	20
1978	24
1979	27
1980	31
1981	47
1982	56
1983	70
1984	40
1985	280
1986	430
1987	530
1988	699
1989	730
1990	1030
1991	1530
1992	2030
1993	2530
1994	3130
1995	3359
1996	3632
1997	3680
1998	6570
1999	3900
2000	4420
2001	3610
2002	2651
2003	3462
2004	4003
2005	4304
2006	5652
2007	8233
2008	7474
2009	7548.68
2010	8058.14
2011	11912.22
2012	8839.76
2013	30881.3
2014	34220.3
2015	36037.75
2016	30974.22
2017	28756.16
2018	30921.46
2019	34087.49
2020	42118.9
2021	50977.22
2022	59080.29